This client's daughter uses a stander and a wheelchair, each with a tray, to play (see pictures in gallery and files). She mainly uses VTech type toys on the tray however they get knocked off easily. It means she has to wait for someone else to put it back on the tray to continue playing with it.

Your task is to design a mechanism that can hold different type of toys on the tray. It must be easily installed and removed. It must be variable to hold different toys and work with both trays. It must be easily stored and maintained. It should be safe and easy to clean.